here with more is defense specialist alisyn barey. what do you think? where did they learn how to make the bombs they used? >> right. the really scary thing is that you don't have to travel abroad to become radicalized. i think that's one really chilling aspect we need to stress here. doesn't have any boundaries. gain access to mentors and establish a terrorist organization like al qaeda that you mentioned through the internet. you can download videos that will teach from you radical teachers and clerics. teach you how to avoid detection. seen that avoiding authorities. self-contained as a cell. how to build bombs has been widely discussed on that. >> brian: older one getting married, having a kid. boxer on. -- these examples of two guys looking to blend in and maybe not being able to? >> really great question, brian, we have seen a lot. unfortunately the u.k. is a little bit more ahead of the curve in terms of flourishing homegrown terrorism. all too frequently we have seen this pattern of young men, often a leader around the same age, often brothers w